openat variant

1 files changed, 39 insertions, 0 deletions

diff --git a/openat/examples/exchange.rs b/openat/examples/exchange.rs
new file mode 100644
index 0000000..21fdf0a
--- /dev/null
+++ b/openat/examples/exchange.rs
@@ -0,0 +1,39 @@
+extern crate argparse;
+extern crate openat;
+
+use std::process::exit;
+use std::path::PathBuf;
+
+use argparse::{ArgumentParser, Parse};
+use openat::Dir;
+
+#[cfg(not(target_os="linux"))]
+fn main() {
+    println!("Atomic exchange is not supported on this platform")
+}
+
+#[cfg(target_os="linux")]
+fn main() {
+    let mut path1 = PathBuf::new();
+    let mut path2 = PathBuf::new();
+    {
+        let mut ap = ArgumentParser::new();
+        ap.refer(&mut path1)
+            .add_argument("path1", Parse, "First path of exchange operation")
+            .required();
+        ap.refer(&mut path2)
+            .add_argument("path2", Parse, "Second path of exchange operation")
+            .required();
+        ap.parse_args_or_exit();
+    }
+    if path1.parent() != path2.parent() {
+        println!("Paths must be in the same directory");
+        exit(1);
+    }
+    let parent = path1.parent().expect("path must have parent directory");
+    let dir = Dir::open(parent).expect("can open directory");
+    dir.local_exchange(
+        path1.file_name().expect("path1 must have filename"),
+        path2.file_name().expect("path2 must have filename"),
+    ).expect("can rename");
+}